Beginner in need of help !!

[robbo78]

Update: Ive looked in the data sheet & found out the reason for dividing by either 24 or 32, if your working out low range then : 24, high range : 32. Thats another thing understood.

So the last thing I am struggling to understand now is, how do you get the number from th bits?

VR<3:0> = 1111 (15). < How on earth do you get 15 from just bits 1111?

This is the only thing that I'm struggling to understand now.

Thanks,
Rob